Method __call__

tests/lib/test_credentials.py:1500–1504

(self, *, force_refresh: bool = False)

            calls = 0

            def __call__(self, *, force_refresh: bool = False) -> AccessToken:  # noqa: ARG002
                self.calls += 1
                if self.calls == 1:
                    return first
                raise WorkloadIdentityError("backend down")

        provider = P()
        cache = TokenCache(provider, time_source=clock)